I have a calc quiz tomorrow and have a quick question on integration. When do I use U-Substitution as an integration method vs Partial Fractions? Are they the same thing? Can I use either or in any integration problem? For example, Can't this problem be done by both methods?

step by step solution :

step   1   :

1.1     4 = 22

(4)3 = (22)3 = 26

equation at the end of step   1   :

  ((23) • 26)2

step   2   :

equation at the end of step   2   :

  (23 • 26)2

step   3   :

final result :

  218

ya

#12 the answer is the third option

the answer is  

d.

21

i did this one. so you should get it right.